Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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for CN and metals used in the process are important. A number of test kit sup- pliers are available to choose from. It is not always necessary to have the sophis- tication of a spectrophotometer or atomic absorption unit for in-house trou- bleshooting and quality control. It is important, however, to have this service and complete analytical services available from a competent outside laboratory. All regulatory agencies will require data submission based on approved test meth- ods and procedures with report submittals. It is imperative to know your regulator and communicate with him/her regarding system operations, both good and bad. Most agencies require notifi- cation of system upsets and slug loads. Although the typical metal finisher is reluc- tant to report problems, it is always better to report problems than for the reg- ulator to find them. Notification always can be used as mitigation at enforcement proceedings. COMMON MISCONCEPTIONS AMONG METAL FINISHERS ABOUT WASTEWATER TREATMENT · Regulatory agencies only set effluent standards at reasonable levels necessary for environmental and POTW protection. · Consultants and suppliers always know how to solve your problems. · The use of ion exchange for complete wastewater treatment is a practical approach to eliminating discharges. · Microfiltration is a sure method of compliance because it filters out everything. · The cyanide oxidation system is not working well because you have total cyanide discharge violations. · When floating in the clarifier occurs, the probable cause is oil and grease. · A polishing filter will solve all the problems. · Metal violations are always due to clarifier or polishing filter problems. · All laboratories generate good data. · pH and ORP electrodes only have to be cleaned weekly. · If poor floc formation is observed, the polymer is bad or you're not adding enough. · In most cases, sludge dryers will save you money. · Clarifiers and filter press cloths do not need to be periodically cleaned. · The pH reading on the controller is always correct. 535

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